Grandad Flyer
I have done two BFRs in the US and both times the format has been an hour on the grounds looking at the key FARs and ane hours airwork.
Both were very usful and non-threatening, as the instructor (different each time) prefaced the BFR with a statement that this is not a pass/fail test.
Of course, they could decline to sign your logbook and no doubt would in the appropriate circumstance, but based on past experience I am looking forward to my next BFR as a motivational and reassuring couple of hours.
F3G